I can confirm this is true. No matter how messed up my back is, I can make the pain go away for awhile by sitting in front of the PS2. Grand Theft Auto: Vice City and Nascar:Dirt to Daytona are the most effective, currently.
When I had my surgery, Tony Hawk Pro Skater 2 and Unreal Tournament worked really well.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.